#If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. 
#The sum of these multiples is 23.Find the sum of all the multiples of 3 or 5 below 1000.

#!/usr/bin/python3
#coding=utf8
sum=0
for i in range(1, 1000):
    if(i%3==0 or i%5==0):
        sum+=i
print(sum)